Calculate 62+31
[2891] Calculate 62+31 - If 87+92=18, 57+83=13, 12+61=4 then 62+31=? - #brainteasers #math #riddles - Correct Answers: 118 - The first user who solved this task is On On Lunarbasil
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Calculate 62+31

If 87+92=18, 57+83=13, 12+61=4 then 62+31=?
Correct answers: 118
The first user who solved this task is On On Lunarbasil.
#brainteasers #math #riddles
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Barber shop

President George Bush and President Barack Obama ended up at the barbershop at the same time.

As they sat there, each being worked on by a different barber, not a word was spoken.

The barbers were even afraid to start a conversation, for fear it would turn to politics.

As the barbers finished their shaves, the one who had President Bush in his chair reached for the aftershave. President Bush was quick to stop him, saying: “No thanks, my wife will smell that and think I've been in a whorehouse.”

The second barber turned to President Obama and said: “How about you, Mr. President?

Obama replied, “Go ahead, my wife doesn't know what the inside of a whorehouse smells like.”

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Crystal rectifier

In 1874, a paper by Ferdinand Braun (1850-1918) was published in the Annalen der Physik und Chemie describing his discovery of the electrical rectifier effect. He observed that certain crystals of metal sulphides have a larger or smaller resistance to an electric current, depending on its direction of flow. He used a galena crystal, a semiconductor material composed of lead sulfide. He found the rectifying effect especially true if at least one of the electrodes was a pointed wire. Thus, he had discovered the point-contact rectifier effect, the first semiconductor device. This effect wasn't used until over 30 years later in the form of the “cat's whisker”crystal radio detector which ultimately led to the point-contact transistor first produced in 1948.
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